Appendix A Device-Specific Information
© National Instruments Corporation A-23 NI USB-621x User Manual
Note For more information about default NI-DAQmx counter inputs, refer to Connecting
Counter Signals in the NI-DAQmx Help or the LabVIEW Help in version 8.0 or later.
Connecting Signals to the USB-6218 BNC
Analog Input
You can use each analog input BNC connector for one signal in differential
mode or two signals in single-ended mode:
• Differential Mode—To connect signals in differential mode,
determine the type of signal source you are using—a floating signal
(FS) source or a ground-referenced signal (GS) source. Refer to the
Connecting Analog Input Signals on USB-6215/6216/6218 Devices
section of Chapter 4, Analog Input, for more information.
To measure a floating signal source, move the switch to the FS
position. To measure a ground-referenced signal source, move the
switch to the GS position. Figure A-15 shows the AI 0 BNC and
corresponding FS/GS switch on the top panel of the USB-6218 BNC.
Table A-7. Default NI-DAQmx Counter/Timer Pins
Counter/Timer Signal Default Terminal Name
CTR 0 SRC PFI 0
CTR 0 GATE PFI 1
CTR 0 AUX PFI 9
CTR 0 OUT PFI 4
CTR 0 A PFI 0
CTR 0 Z PFI 1
CTR 0 B PFI 9
CTR 1 SRC PFI 3
CTR 1 GATE PFI 2
CTR 1 AUX PFI 10
CTR 1 OUT PFI 5
CTR 1 A PFI 3
CTR 1 Z PFI 2
CTR 1 B PFI 10
FREQ OUT PFI 6
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